mxge's tunable hw.mxge.rss_hash_type cannot be set from the

mxge's tunable hw.mxge.rss_hash_type cannot be set from the
loader, because it uses a reserved suffix (_type).  Fix
this by removing the "_" and renaming the tunable to
hw.mxge.rss_hashtype.  The old (rss_hash_type) tunable is
still fetched, in case people load the driver via scripts.
When both are present in the kernel environment,
the new value (hw.mxge.rss_hashtype) overrides the old
value.

Approved by:	re (kib)